CVE-2026-73325: Fujitsu Research Onecompression

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Fujitsu Research's OneCompression library before 1.2.1 contains an unsafe deserialization vulnerability that allows attackers to execute arbitrary code by supplying a crafted model.pt checkpoint file, as QuantizedModelLoader.load_quantized_model_pt() unconditionally calls torch.load with weights_only=False, invoking Python's pickle machinery during deserialization. Attackers can embed malicious __reduce__ methods in a crafted model checkpoint to execute arbitrary Python code, including system commands, when the library loads the file from a caller-selected model directory.

Affected products

• Fujitsu Research Onecompression: before 1.2.1 (fixed in 1.2.1)

Published 2026-08-12. Last modified 2026-09-24.